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They love recommending powerflush, specially in summer 😂 The other day I got a second opinion from a local plumber doing an annual service and he told me I shouldn’t bother. He said you just need inhibitor if system is emptied and recommended a magnetic filter (whoever installed the system hadn’t put one)
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a magnetic filter
Many companies will extend their warranty if one is fitted. Ours (Worcester Bosch) was 7 years without, 10 years with a magnetic filter.
When we had our boiler replaced they recommended a power flush, but having seen the before/after IR camera shots of the radiators I can see it was justified. Must have been no idea how many years of crap building up in most of our radiators.
Thanks . Maybe just some inhibitor then . Which I think might be the recommendation of the plumber, we will see ..